docs: update ethers-rs README note (#798) #2141

Job	Run time
miri --no-default-features	5m 16s
miri	5m 2s
test ubuntu-latest stable --no-default-features	1m 16s
miri --all-features	7m 39s
test ubuntu-latest stable	1m 16s
check no_std	51s
test ubuntu-latest nightly --no-default-features	1m 20s
test ubuntu-latest nightly	1m 17s
clippy	1m 12s
test ubuntu-latest 1.79 --no-default-features	41s
docs	56s
test ubuntu-latest 1.79	37s
test windows-latest stable --no-default-features	2m 58s
features stable	2m 10s
test windows-latest stable	3m 0s
wasm	39s
features stable --all-targets	3m 24s
test windows-latest nightly --no-default-features	3m 11s
features nightly	2m 22s
test windows-latest nightly	3m 8s
features nightly --all-targets	3m 36s
test windows-latest 1.79 --no-default-features	1m 22s
test windows-latest 1.79	1m 44s
test ubuntu-latest 1.79 --features json	38s
fmt	13s
test windows-latest 1.79 --features json	1m 29s
test ubuntu-latest nightly --all-features	1m 22s
test windows-latest nightly --all-features	3m 18s
ci success	1s
	1h 1m 58s

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